Manhold cover



Dec. 4, 1928. 1,694,133

MANHOLE covER Patented Dec. 4, 1928. 4

UNITED STATES PATENT OFFICE.

EDWARD T. McI-IUGH, DECEASED, LATE OF HOLYOKE, MASSACHUSETTS, BY AGNES J. MoH-UGH, EXECUTRIX, OF HOLYOKE, MASSACHUSETTS.

MANHOLE covna.

Application filed April 15, 1922. Serial No. 553,244

This invention relates to improvements in man hole covers and one of its leading objects is to provide a cover which can not be lifted by boys and will thus prevent persons from falling into man holes that have been opened by boysor others without authority.

Another object of the invention is to provide a man hole cover with a concealed latch for retaining the same in locked position and a hinge connection which will resist upward. movement of the cover except when the cover is disposed'in a vertical position at the hinge joint and it will then permit of the detachment-of the cover from the base ring. A still further object ofthe invention is to provide a man hole cover designed toresist heavy truck loads and the like against breakage or crushing and also to prevent clo ging from debris.

lTit-h the above and other objects in view this invention relates to certain new and useful constructions, combinations and arrangements of parts,c1early described in the following specification and fully illustrated in the accompanying drawings, in which:

Figure 1 is a top plan. View.

Figure 2 is a detail vertical sectional view taken on line 2 of Fig. 1.

Figure 3 is a similar view taken on line 3- of Fig. 1.

Figure 4 is a similar view taken on line 4 of Fig. 1.

Referring to the accompanying drawings 5 designates a base ring WhlCh IS provided with a sloping and slightly concave outer peripheral surface 7 The ring'5 is formed with a base circular rib 8 shown to be located along the inner marginal portion [thereof so that a shoulder 9 is provided outwardly of said rib 8 for the head 5 of said ring.

The ring 5 is formed on one side with recesses 10 and 11 which receive the L-shaped hinge lugs 12 and 13, respectively. Over each of said recesses, a stop or retaining lug 14 is formed which is adapted to resist upward movement of the hinge lug, but to permit of a hinge movement of the lug in the recesses and on the shoulder 15 forming the base of each recess.

The lugs 12 and 13 are formed on the cover section 16 which is provided with a series of debris or waste openings 17. The cover 16 is also provided with a plurality of circumferentially spaced lugs 18 which are adapted torest upon the sloping surface 7 of the base ring 5 and which support the weight of the cover 15. The cover-V15 is preferably convex on its upper surface and concave on its bottom surface so as to afford resistance to any load or weight placed thereon. A latch lever 20 is pivoted by; the pin 29 to the lug 28 integral with the cover 16, and from the lug the latch extends under a bar 22 forming a part of the cover 16 and the inner portion of said: latch lever is considerably weighted so as to hold the nose 28 in looking engagement with the wall 24 of the recess 25 formed in the rib 8; The rear end of the-latch lever 20 normally projects a slight distance below the under side of the bar 22 and the openings 22*" located onthe opposite sides'of said bar are adapted to permit of a workman extending his fingers therethrough so that the latch lever 20 may be operated and shifted to unlatching position and then the cover 16 tilted to vertical position upon the hinge lugs 12 and 13 andv when it has beenplaced in a vertical position it may be bodily lifted from the shoulders 15 of the base ring 5.

The outer peripheral edge of the cover 16 is preferably formed with a convex surface and which is spaced a slight distance from thesloping surface 7 of: the base ring 5 so as to provide waste passages 26" between the cover 16 and thebase ring 5.

The manhole cover may be made of various sizes and thicknesses and reinforced by any special change of design deemed necessary for purposes of strengthening the same.

The openings formed in the cover and between the cover of the base ring are such as to insure of free downward movement of any debris forced into the openings and to thus prevent clogging of the man hole cover and consequently prevent poor street drain- Having described the invention, what is claimed is: v

1. A manhole cover consisting of the combination with a base ring of a cover, the base ring having recesses spaced from each other on one side thereof, each of said recesses having an underlying support and an overlying stop lug of less horizontal extent than the length of the support, said base ring also having a. pendant and inwardly projecting lug on the side opposite to the recesses, the cover having hinge lugs disposed in the re- (-esses under the stop lugs thereof and supported onthe said supports, the cover also having aweighted latch pivoted thereto and 7 overlying said latch and normally concealing the same from view.

2. A man hole closureconsisting of a stationary vring designed to be mounted in a roadway and constructed with a circular opening having an inwardly and downwardly slopingwvall providing a self centering seat, said ring beingalso constructed with a pair of recesses anda-n integral lug-located between the recesses, each of the recesses having a seat and an overlying ledge ofless width than the seat, and a cover having a plurality of integral lugs projecting outwardly from the edge thereof to end the self centering seat of the ring and support said cover thereon with a series of normally open drain passages between the cover and the ring wall, the cover having a pair of integral hinge lugs to enter the recesses, said hinge lugs being constructed to enter said recesses when the cover is placed in an upright position and said seats being adapted to support the cover when the hinge lugs are disposed thereon, the recesses having a depth sufficient to receive the lugs when the seat is lowered to a normal horizontal position and in this position said lugs being locked by the overlyin ledges against direct vertical movement, whereby thecover Will be retained in concentric relation to the ring and held against displacement therefrom when a heavy vehicle passes'over the cover and ring and the cover can only be removed by first swinging it into an upright position and then moving it vertically. a

3. A man hole closure consisting of a cover having a pair of bin e lugs projecting from the edge thereof anc l in spaced relation to each otl1er, the cover also having a series of integral lugs spaced from each other and projecting from the edge therefrom, and a base ring for supporting the cover having a sloping wall upon which the series of lugs may rest to center the cover relatively thereto, said ring also having a pair of recesses (toreeeive the hinge lugs, each of said recesses having a seat to support one of the hinge lugs and an overlying ledge to prevent verticle movement of the hinge lug disposed on said seat when the cover is in a normal hori zontal position, the cover being shifted by the sloping wall so that both of said hing lugs will normally lie under said ledges when thecover is in a normal horizontal position and both of said hinge lugs will be forced inwardly. of said recesses when the cover is swung to an upriht position, whereby the cover Will be helc against displacement in its normal position and may be removed only by swinging it to an upright position and then by a lifting action thereon.

4.1x manhole cover consisting of a massive plate having a convex upper surfaceand provided witha series of external lugs projecting from the edge thereof and also formed with a series of drain openings providing atleast one into al handhold bar on one side of the center 0, the plate, said plate having a hinge element on theopposite side of the plate, a locking lever pivoted to the underside of the plate to lie directly under said handheld. bar and be normally concealed thereby so that said lever may begrasped when a human hand is extended through said drain openings, and means for supporting said cover providing a seat forsaid lugs, and equipped'with a hinge element to cooperate with the hinge elementof the cover and with additional means engageable by the outer end of said lever, whereby said cover may be locked against vertical swinging movement.

Signed byme at Holyoke, Mass.

y a AGNES J. MOHUGH, Emeoutrim of Edward T. MaHugh, Deceased. 

